Question

I am creating an app in which I have to create a plist when the app launches for the first time. I’m later going to use the plist to store details a user later inputs. How can I detect the first launch of the app? I was experimenting with NSUserDefaults but I think I’m doing something wrong.

Answer 1

You can do this with NSUserDefaults. But be careful with the Version Number.

Do the following:

NSString *bundleVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString *)kCFBundleVersionKey];

NSString *appFirstStartOfVersionKey = [NSString stringWithFormat:@"first_start_%@", bundleVersion];

NSNumber *alreadyStartedOnVersion = [[NSUserDefaults standardUserDefaults] objectForKey:appFirstStartOfVersionKey];
if(!alreadyStartedOnVersion || [alreadyStartedOnVersion boolValue] == NO) {
    [self firstStartCode];
    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:YES] forKey:appFirstStartOfVersionKey];
}

the selector firstStartCode will only be called on time for each application version on the very first run.

Okay?